infrared absorption spectroscopy near-infrared absorption spectroscopy near infra-red spectrometry CHMO:0000638 near infrared spectrometry near infra-red absorbance spectroscopy NIR absorbance spectroscopy near infrared absorption spectroscopy Spectroscopy where the sample absorbs radiation from the near infrared region (0.8–2 μm). near infrared absorbance spectroscopy NIRS near-infra-red absorption spectrometry near infrared spectroscopy near infrared absorbance spectrometry near infrared absorption spectrometry NIR absorbance spectrometry near infra-red absorbance spectrometry near infra-red absorption spectrometry